Download Managing Telecommunications

Managing
Telecommunications
Chapter 6
Emily Gehm
Jessica Paul
Melanie Wall
The Evolving
Telecommunications Scene
A New Telecommunications Infrastructure Is
Being Built
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“Infrastructure of old” is the telephone network,
Public Switched Telephone Network (PSTN)
– Built on twisted-pair copper wires and was intended for
voice communications
– Uses analog technology and circuit switching
– Based on “dumb voice telephones”
The Evolving Telecommunications
Scene (con’t)
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“Infrastructure of New” aimed at transmitting data
using fiber optic links sending digital signals
– Uses Packet Switching
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No circuit created
Each packet can take a different route through the network
– Use of more intelligent user devices that provide
addressing information
– Internet can handle new kinds of intelligent user devices
– Global telecom infrastructure is changing from a focus on
voice to a focus on data
The Evolving Telecommunications
Scene (con’t)

The Telecom Industry Is Being Transformed
– Originally provided by monopolies
– Becoming like the computing industry

Internet Is the Network of Choice
– Extranets
– Voice Over IP
Voice Over IP
The OSI Reference Model
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Open Systems Interconnection
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Created by the ISO
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Underlying Framework of Internet
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Why Is It Called A Reference Model?
OSI’s Upper Layers
7. Application Layer
– Interface to application
6. Presentation Layer
– Translates data to and from
language in Layer 7
5. Session Layer
– Controls dialog, acts as moderator
for a session
OSI’s Lower Layers
4. Transport Layer
– Controls flows, ensures reliable
packet delivery
3. Network Layer
– Addresses and routes packets
2. Logical Link Layer
– Error correction & data
synchronization
1. Physical Layer
– Defines physical connection to
OSI Model Diagram
Example
Wireless…The Next Frontier
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The Next Big Thing
Mobile Computing
Wireless Computing
Wireless Areas Discussed
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Personal Area Networks (PANs): To connect a
laptop computer to a cell phone
LANs: In an office building or warehouse as a
wireless LAN
WLL: To handle “the last mile”
Long Distance: To provide voice services to
mobile people via their cell phones
M-commerce: To transact business wirelessly via
PDAs, smart phones, or other information
appliances communicating through the Internet.
Wireless PANs
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Personal Area Network
Main Technologies: infrared and
Bluetooth
Wireless LANs
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Local Area Network
Two Technologies: infrared and
microwave
Two Topologies: peer to peer and
client server
Wireless Local Loops
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The Goal
“Fixed Wireless”
“Last Mile Problem”
Wireless Long Distance
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Only two wireless technologies in the
microwave range
Cell Phones
GSM (Global System for Mobile
Communications)
TDMA (Time Division Multiple Access)
CDMA (Code Division Multiple Access)
CDPD (Cellular Digital Packet Data)
SMS (Short Messaging Services)
M-Commerce
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Mobile Commerce
The Vision
Ways to Send E-mail
Is Wireless Safe?
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Damage To DNA!!
(EMR) Electro-magnetic radiation
Spikes=dead cells
Role of the IS Department

Interoperability
– Connectivity
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Operate the Network
– Many companies outsource
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Stay Current with Technology
– Continually “peering” into the future
The End